Instruction manual for devices of the MASI20 series
10
V 1.0
2.4 Electrical specification
2.4.1 System cables
To meet individual application requirements, system wiring on the field bus side can be realized either
with round cables
2
or also with the yellow ribbon cable
3
characteristic for AS-Interface systems.
Cables are basically of the 2-wire type without PE cable. Cable screening in not necessary thanks to the
transmission technology.
Two electrical aspects are decisive in the selection of a suitable transmission cable :
a)
DC resistance
(line cross-section)
for reasons of auxiliary power transfer
b)
Transmission characteristics
Impedance from 80 to 120 ohms for 167 kHz
Additional auxiliary power is usually required for actuators.
Cable leads
brown
-
Field bus system cable (ASI+)
24V DC auxiliary power (+24V DC)
blue
-
Field bus system cable (ASI-)
24V DC auxiliary power DC (0V)
Fig. 2-4
:
AS-Interface round cable according to DIN VDE 0281 Part 402
For standard profiled cables, the strand insulation is made of a rubber compound. For more critical
applications, particularly as regards chemical stability, TPE or PUR cables are available.
The main area of application is the stationary wiring of machines and installations in a rough environment.
For the transmission cable, you can also use a common 2-wire round cable without PE cable, particularly
for chained applications or wiring in switch cabinets.
2
Art. No 55 747
3
Art. No. 55 743
